On our plane knowledge and ignorance are the immemorial adversaries.

Man cannot influence in this respect the atomic forces of Nature.

But what sin is to the moralist and crime to the jurist so to the scientific man is ignorance.

The pure air and dazzling snow belong to things beyond the reach of all personal feeling, almost beyond the reach of life.

Chemistry has been termed by the physicist as the messy part of physics, but that is no reason why the physicists should be permitted to make a mess of chemistry when they invade it.

The history of man is dominated by, and reflects, the amount of available energy

An inexplicable fact is infinitely preferable to an incomprehensible mystery.